Table 1. Summary of mtDNA introgression detected in all 23 species of western chipmunks (subgenus Neotamias).

Taxon	N	# Int. (%)	Source	Div. time (Myr)	Maximum mtDNA % Div	Ref
T. r. ruficaudus	131	0 (0)	NA			1,2
T. r. simulans	175	63 (36)	T. r. ruficaudus	0.35	4.7	1,2
T. a. canicaudus	46	46 (100)	T. r. simulans	2.75	3.2a	2,3
T. a. luteiventris	148	43 (29)	T. r. ruficaudus	2.75	10.0	2,3
Other T. amoenus	122	0 (0)	NA			4
T. dorsalis	54	35 (65)	T. cinereicollis,	1.33	4.6	5
			T. umbrinus,	1.78	4.7	5
			T. quadrivittatus	1.33	4.7	5
			Not assignableb		4.7	5
T. cinereicollis	25	7 (28)	Not assignableb		4.7	5
T. umbrinus	64	9 (19)	Not assignableb		4.7	5
T. canipes	8	0 (0)	NA			5
T. rufus	14	0 (0)	NA			5
T. quadrivittatus	38	14 (37)	Not assignableb		4.7	5
T. townsendii	6	0 (0)	NA			6
T. ochrogenys	0	NA	NA			NA
T. sonomae	4	0 (0)	NA			6
T. siskiyou	5	0 (0)	NA			6
T. senex	155	0 (0)	NA			5,6
T. quadrimaculatus	221	0 (0)	NA			5,6
T. minimus	305	0 (0)	NA			5
T. panamintinus	15	15 (100)	T. minimus	2.75	10.0a	6,7
T. alpinus	34	0 (0)	NA			6,7
T. speciosus	56	56 (100)	T. minimus	2.75	10.0a	6,7
T. merriami	155	0 (0)	NA			7
T. obscurus	87	0 (0)	NA			7
T. bulleri	1	?	NA			6
T. durangae	1	?	NA			6
T. palmeri	1	?	NA			5
Totals	1871	298

Abbreviations: mtDNA, mitochondrial DNA; Div, divergence; Int, number of introgressed individuals; NA, not applicable.

1–Good and Sullivan (2001).

2–Good et al. (2003).

3–Good et al. (2008).

4–Demboski and Sullivan (2003).

5–This study.

6–Reid et al. (2012).

7–Demboski et al. (in prep).

^aOnly introgressed mtDNA has been identified.

^bThe introgressed mtDNA is clade C in Figure 2 and cannot be assigned as native to any taxon.